Add start time to LmkKillOccurred

This is to measure an application's behavior with respect to being LMKed
(the longer an app lives before being LMKed, the better).

Bug: 119854389
Test: Manual
Change-Id: I4ef6433391c8758626334731d2b5de038e4468ae
Merged-In: I4ef6433391c8758626334731d2b5de038e4468ae
(cherry picked from I4ef6433391c8758626334731d2b5de038e4468ae)
diff --git a/lmkd/statslog.c b/lmkd/statslog.c
index 66d1164..689e8ae 100644
--- a/lmkd/statslog.c
+++ b/lmkd/statslog.c
@@ -65,7 +65,7 @@
 stats_write_lmk_kill_occurred(android_log_context ctx, int32_t code, int32_t uid,
                               char const* process_name, int32_t oom_score, int64_t pgfault,
                               int64_t pgmajfault, int64_t rss_in_bytes, int64_t cache_in_bytes,
-                              int64_t swap_in_bytes) {
+                              int64_t swap_in_bytes, int64_t process_start_time_ns) {
     assert(ctx != NULL);
     int ret = -EINVAL;
     if (!ctx) {
@@ -113,5 +113,9 @@
         return ret;
     }
 
+    if ((ret = android_log_write_int64(ctx, process_start_time_ns)) < 0) {
+        return ret;
+    }
+
     return write_to_logger(ctx, LOG_ID_STATS);
 }